Tag: M.W=400-500

Soars, Shafer published the artcileStimuli-Responsive Depolymerization of Poly(Phthalaldehyde) Copolymers and Networks, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is stimulus responsive depolymerization polyphthalaldehyde mercapto network.

This article describes a stimuli-responsive crosslinked network based on a poly(phthalaldehyde) (PPA) self-immolating polymer backbone which, upon removal of polymer end-caps, becomes degradable under ambient conditions. Self-immolating polymers (SIPs) are of particular interest due to their ability to undergo controlled depolymerization resulting in the elimination of the polymer structure and potential recovery and reuse of the original monomers. Linear copolymers of phthalaldehyde and unsym. allylated-phthalaldehyde monomers are obtained via anionic polymerization with appreciable incorporation of the allyl-functional monomeric units. This approach enables crosslinking of the otherwise linear polymers via thiol-ene reactions with the allyl functional phthalaldehyde polymers. The polymer network thus formed unzips along the phthalaldehyde backbone to yield monomers and low mol. weight fragments in response to chem. (F-, H+) or phys. (light, sonication) stimuli that remove the stabilizing functional endcaps on the phthalaldehyde polymers. Rheol. is used to demonstrate gelation within 5 s of light exposure of the allylated-phthalaldehyde polymers reacted with pentaerythritol tetrakis(3-mercaptopropionate) and photoinitiator (3 wt%). Triggerable degelation makes this material well suited for photolithog. and additive manufacturing as well as other applications that necessitate polymer network degradation or elimination. Further, a method is described for determining the degelation temperature of a self-immolative crosslinked network.

Macromolecular Chemistry and Physics published new progress about Crosslink density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Safety of Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ohzono, Takuya published the artcileInternal constraints and arrested relaxation in main-chain nematic elastomers, Synthetic Route of 7575-23-7, the main research area is nematic liquid crystal elastomer mech optical property.

Nematic liquid crystal elastomers (N-LCE) exhibit intriguing mech. properties, such as reversible actuation and soft elasticity, which manifests as a wide plateau of low nearly-constant stress upon stretching. N-LCE also have a characteristically slow stress relaxation, which sometimes prevents their shape recovery. To understand how the inherent nematic order retards and arrests the equilibration, here we examine hysteretic stress-strain characteristics in a series of specifically designed main-chain N-LCE, investigating both macroscopic mech. properties and the microscopic nematic director distribution under applied strains. The hysteretic features are attributed to the dynamics of thermodynamically unfavored hairpins, the sharp folds on anisotropic polymer strands, the creation and transition of which are restricted by the nematic order. These findings provide a new avenue for tuning the hysteretic nature of N-LCE at both macro- and microscopic levels via different designs of polymer networks, toward materials with highly nonlinear mech. properties and shape-memory applications.

Nature Communications published new progress about Crosslink density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Synthetic Route of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ge, Meiying published the artcileBuilding biobased, degradable, flexible polymer networks from vanillin via thiol-ene “”click”” photopolymerization, Application In Synthesis of 7575-23-7, the main research area is thiol ene click photopolymerization flexible polymer network preparation.

Research on biobased degradable flexible polymers with high transparency and outstanding mech. performance is of great importance for the rapid and sustainable development of flexible devices. Herein, renewable vanillin was chosen to synthesize a biobased allyl ether monomer (BAMTU) with high aromaticity and degradable acetal groups. BAMTU and thiol with different functionalities were then polymerized through thiol-ene “”click”” photopolymerization to form three kinds of thiol-ene networks (BAMTU-SH) with tunable properties. Their glass transition temperatures ranged from 20 to 49°, their tensile strength and elongation at break were 2.9-18.2 MPa and 103.5-305.6%, resp. BAMTU-SH4 showed the best integrated mech. performance, for which the toughness was the highest (14.5 MPa). These BAMTU-SH networks exhibited high transparency with a transmittance of 89.4-90.5% at 550 nm. Moreover, all of them could be degraded in mild acetic acid solution The high-performance BAMTU-SH networks have potential applications in flexible device substrates while their degradability will contribute to environmental protection.

Polymer Chemistry published new progress about Crosslink density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application In Synthesis of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Li, Wenbin published the artcileThermal-induced self-healing bio-based vitrimers: Shape memory, recyclability, degradation, and intrinsic flame retardancy, COA of Formula: C17H28O8S4, the main research area is shape memory vitrimer intrinsic flame retardancy.

The structure of epoxy resin determines its flammable property, non-reprocessing, unrecyclable, and nondegradable, which limits their application. Thus, a novel disulfide bond-containing dynamic covalent thiol-ene crosslinked epoxy vitrimers (TECEVs) as covalently adaptable networks were synthesized. Also, the structure-property relationship of polymeric compounds was investigated. The insoluble vitrimers networks demonstrated faster stress relaxation with 107 s at 200°, and obtained lower activation energy between 70.52 and 110.57 kJ·mol-1. In addition, the dynamic nature of the disulfide bond allowed the damaged TECEVs to be thermal-induced self-repairing and self-healing materials with efficiencies 100% at 160°. It was discovered that TECEVs can be reprocessed at 160° with the recovery of mech. strength above 80% and be completely decomposed in an ethanol-acid catalyst solution Moreover, typical TECEVs can function with excellent flame retardancy and illustrated a high limit oxygen index (LOI, 27.45-28.36%), and UL-94 V-0 rating was achieved. This work could provide an efficient strategy for the synthesis of “”biobased self-repairing flame retardant”” networks and contribute to the development of high-performance sustainable polymers.

Polymer Degradation and Stability published new progress about Crosslink density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, COA of Formula: C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Reisinger, David published the artcileIntroduction of Photolatent Bases for Locally Controlling Dynamic Exchange Reactions in Thermo-Activated Vitrimers, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is photolatent base dynamic exchange thermoactivated vitrimer epoxy crosslinking; photoactivation vitrimer transesterification catalyst epoxy thiol; materials science; photochemistry; photolatent base; polymers; vitrimer.

Vitrimers exhibit a covalently crosslinked network structure, as is characteristic of classic thermosetting polymers. However, they are capable of rearranging their network topol. by thermo-activated associative exchange reactions when the topol. freezing transition temperature (Tv) is exceeded. Despite the vast number of developed vitrimers, there is a serious lack of methods that enable a (spatially) controlled onset of these rearrangement reactions above Tv. Herein, we highlight the localized release of the efficient transesterification catalyst 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) by the UV-induced cleavage of a photolatent base within a covalently crosslinked thiol-epoxy network. Demonstrated with stress relaxation measurements conducted well above the network’s Tv, only the controlled release of TBD facilitates the immediate onset of transesterification in terms of a viscoelastic flow. Moreover, the spatially resolved UV-mediated photoactivation of vitrimeric properties is confirmed by permanent shape changes induced locally in the material.

Angewandte Chemie, International Edition published new progress about Crosslink density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Acosta Ortiz, Ricardo published the artcileSimultaneous reduction in situ and thiol- functionalization of Graphene Oxide during the Photopolymerization of Epoxy/Thiol-ene photocurable systems to prepare polyether-polythioether/reduced graphene oxide nanocomposites, Computed Properties of 7575-23-7, the main research area is photopolymerization polyether polythioether reduced graphene oxide nanocomposite.

An efficient method is reported to prepare photocurable polyether-polythioether/reduced graphene oxide (rGO) composites. XPS, energy dispersive X-ray spectroscopy and Raman spectroscopies were used to verify that graphene oxide (GO) was concurrently reduced and functionalized with thiol groups during the photopolymerization of an epoxy/thiol-ene system. The thiol groups introduced to GO during the photo-thermal treatment allowed the covalent bonding of rGO to the polymeric matrix thereby increasing the toughness and mech. properties of the composites despite the reduced crosslink d., in comparison with a control sample without rGO.

Polymer-Plastics Technology and Materials published new progress about Crosslink density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Computed Properties of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Lin, Qianming published the artcileKinetic trapping of 3D-printable cyclodextrin-based poly(pseudo)rotaxane networks, HPLC of Formula: 7575-23-7, the main research area is cyclodextrin polypseudo rotaxane network three dimensional printing.

Synthetically trapping kinetically varied (super)structures of mol. assemblies and amplifying them to the macroscale is a promising, yet challenging, approach for the advancement of meta-stable materials. Here, we demonstrated a concerted kinetic trapping design to timely resolve a set of transient polypseudorotaxanes in solution and harness a crop of them via micro-crystallization By installing stopper or speed bump moieties on the polymer axles, meta-stable polypseudorotaxanes with segmented cyclodextrin blocks were hierarchically amplified into crystalline networks of different crosslinking densities at mesoscale and viscoelastic hydrogels with 3D-printability in bulk. We demonstrated simultaneous 3D-printing of two polypseudorotaxane networks from one reactive ensemble and their conversion to heterogeneous polyrotaxane monoliths. Spatially programming the macroscale shapes of these heterogeneous polyrotaxanes enabled the construction of moisture-responsive actuators, in which the shape morphing originated from the different numbers of cyclodextrins interlocked in these polyrotaxane networks.

Chem published new progress about Crystal structure. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, HPLC of Formula: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

de Souza, Mandy published the artcileWater activated healing of thiolene boronic ester coatings, Category: alcohols-buliding-blocks, the main research area is thiolene boronic ester coating water activated healing.

A vinyl Ph boronic ester (VPBE) was synthesized and cured with pentaerythritol tetrakis(3-mercaptoptopionate) (PTMP) and 3,6-dioxa-1,8-octanedithiol (DODT) to produce boronic ester polymer networks. The reversible nature of the boronic ester linkage in water provides an opportunity to investigate their intrinsic healing for a variety of crosslink densities and healing conditions. The boronic ester networks prepared here, all had sub-ambient glass transition temperatures (Tg) and therefore enhanced mol. mobility at room temperature and above. Intrinsic healing of the different networks is investigated after making scratches on the polymer surface and observing behavior in humid environments, underwater and a hot dry environment. Underwater healing, as measured by the reduction in the size of the scratch, is extemely efficient and completely healed any surface scratches. This is compared with room temperature healing in moist environments where healing efficiency is more than 60% after 6 h. In a hot dry environment, no healing is observed The healing mechanism is investigated using 3D profilometry, optical microscopy and fourier transform IR spectroscopy (FTIR) which revealed that scratches become wider at the scratch rim, but more shallow over time. It is propsed that the presence of moisture at the base of the scratch facilitates a zipping up effect as the surface comes together to re-esterify.

Progress in Organic Coatings published new progress about Coating materials. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Huang, Dijun published the artcilePreparation and characterization of a novel ultraviolet/thermal dual-curing thiol-ene/polyurethane acrylate coating, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is thiol ene polyurethane acrylate coating UV thermal curing.

A novel UV/thermal dual-curing thiol-ene/polyurethane acrylate (PUA) coating of PUA oligomer, tripropylene glycol diacrylate, 2,4,6-trimethylbenzoyldiphenyl phosphine oxide, and trimethylolpropane tris (3-mercaptopropionate) was prepared The coating had a rapid surface drying rate with UV radiation (400 W, 50 W/cm2). For example, the surface of the novel thiol-ene/PUA coating dried within 3 s. The hardness, gel content, and initial decomposition temperature at 5 wt% weight loss of the UV/thermal dual-cured sample after 10 min of UV irradiation, followed by heating at 150°C for 20 min, were 37 D, 90.3%, and 302.2°C, resp., which were higher than the 30 D, 87.7% and 284.9°C of the UV curing control after 10 min of UV irradiation The curing time of the 1-mm-thick coating was 4.5 min in indoor sunlight (2.3 ± 0.3 mW/cm2) with a gel content of 83.8%. This coating could be applied in the rapid prototyping field with UV or sunlight exposure. Thermal treatment after UV curing could increase the crosslinking degree and influence the sample performance.

Journal of Coatings Technology and Research published new progress about Coating materials. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Safety of Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Stalin, Sanjuna published the artcileDesigning Polymeric Interphases for Stable Lithium Metal Deposition, Name: Pentaerythritol tetra(3-mercaptopropionate), the main research area is lithium battery solid electrolyte interphase fluorinated polymer coating stability; Electrochemistry; Lithium batteries; Operando-Microscopy; Polymer Coatings; Solid electrolyte interphases; Stability Analysis.

Reactive metals are known to electrodeposit with irregular morphol. features on planar substrates. A growing body of work suggest that multiple variables: composition, mechanics, structure, ion transport properties, reductive stability, and interfacial energy of interphases, formed either spontaneously or by design on the metal electrode play important but differentiated roles in regulating these morphologies. We examine the effect of fluorinated thermoset polymer coatings on Li deposition by means of experiment and theor. linear stability anal. By tuning the chem. of the polymer backbone and side chains, we investigate how phys. and mech. properties of polymeric interphases influence Li electrodeposit morphol. It is found that an interplay between elasticity and diffusivity leads to an optimum interphase thickness and that higher interfacial energy augments elastic stresses at a metal electrode to prevent out-of-plane deposition. These findings are explained using linear stability anal. of electrodeposition and provide guidelines for designing polymer interphases to stabilize metal anodes in rechargeable batteries.

Nano Letters published new progress about Coating materials. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Name: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts